oracle 操作表示例

1.创建表：
       a. 创建xs表中计算机专业学生的备份
           Create table xs_jsj as select * from xs where zym=’计算机’;
       b.完整的例子：
　　　　　 Create table test (xm char(20) not null,zy varchar(30) default (‘计算机’));
                -- Create table
                create table DEPT
                                (
                                    DEPTNO NUMBER(2) not null,
                                    DNAME VARCHAR2(14),
                                    LOC    VARCHAR2(13)
                                  )
                                tablespace USERS